Sketching Hercules' two clusters

M13 (left) and M92 (right) sketched by Brandon Doyle using an 10-inch Dobsonian-mounted reflector at 120x.

In my August 2011 column, I wrote about a tale of two star clusters in Hercules, the famed Hercules Cluster (M13) and the equally impressive but often-overlooked globular M92. The best way to compare the two is to view them on the same night with identical optics, and it’s great if you can record your findings while appreciating each object’s magnificence.

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